Tag: Nanopositioning

Advances in Piezo Nanopositioning Controllers – Digital vs. Analog

Digital piezo nanopositioning controllers have a reputation for being expensive and only cost efficient in high-end applications. A recent new design approach has changed this situation, making advanced digital control features affordable for main stream piezo motion applications. History of Digital Motion Controllers Position control for magnetic motors has been almost exclusively digital for nearly […]

Advances in Precision Motorized Positioning Systems: Selection Criteria

Motion drive and control technologies are advancing rapidly. This means engineers have access to an expanding spectrum of options to leverage previously unattainable performance and form factors. Rapidly evolving production processes have driven needs for motion control systems that provide higher accuracy, speed, resolution, and repeatability. The motion industry has responded with an expanding palette […]

Nanopositioning: How Mounting and Environmental Conditions Affect Performance

Nanopositioning equipment manufacturers can follow the latest design rules and put the best components into their mechanisms and controllers, often to no avail. If the user does not take the time to follow best practices for mounting, figuring out a suitable supporting structure, the right cable draping, and environmental conditions, much of the intrinsic performance […]

Performance and Applications of Inertia Based Positioning Drives: Q-Motion

Size matters in miniaturization and automation – smaller is usually better. Traditional electromagnetic motors have limitations when it comes to shrinking dimensions while maintaining high efficiency and accuracy of motion with minimized energy consumption. Piezo ceramic inertia motors can fill this gap. The Q-Motion dubbed miniature direct drives can be employed in linear positioners, rotary […]

Performance of Direct-Drive Linear Motor Stages in Precision Positioning Applications

Brushless direct drive linear motors provide advantages over leadscrew and ballscrew driven positioning stages when it comes parameters such as acceleration, maximum speed, accuracy, constancy of velocity, and avoidance of vibration. This article explains types of motors, encoders and provides test data of PI’s new V-551 linear motor stage.   Iron Core and Ironless Motors […]

Piezo Flexure Actuators, Nanopositioners, and Other Piezo Mechanisms for Precision Motion Control Applications

Flexure-guided and motion-amplified actuators and positioning stages provide convenience and performance for the OEM designer and scientist. Piezo actuators, a special form of electro-ceramics, are the gold standard when it comes to precision, speed, and force in a small package. To make them more accessible for the OEM designer, manufacturers package the actuators inside an […]

Measuring the Smallest Resolution of a Positioning Stage

The trace above, measured by a laser interferometer, shows peak-to peak noise (black) of a linear motor positioning system on the order of 1.8 nm (controller is actively holding a position, no position change commanded). The noise measured by the external metrology (laser) contains the sum of all mechanical and electrical sources – the amplifier […]

Sensor Influence on the Precision of Piezo Positioning Stages

The choice of feedback sensor is one of the key performance factors of a piezo positioning stage. Below is a comparison between the two most commonly used sensors. When the absolute positioning information plays a critical role in scientific results, researchers prefer capacitive sensors. When cost is most important and / or results are based […]

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About PI

PI (Physik Instrumente) is a leading manufacturer of precision motion control equipment, piezo motors, air bearing stages and hexapod parallel-kinematics for semiconductor applications, photonics, bio-nano-technology and medical engineering. PI has been developing and manufacturing standard & custom precision products with piezoceramic and electromagnetic drives for 4 decades. The company has been ISO 9001 certified since 1994 and provides innovative, high-quality solutions for OEM and research. PI is present worldwide with fifteen subsidiaries, R&D / engineering on 3 continents and total staff of more than 1,000.

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